diff --git a/gcc/graphite.h b/gcc/graphite.h
index d22c4f2..e69edf2 100644
--- a/gcc/graphite.h
+++ b/gcc/graphite.h
@@ -37,6 +37,8 @@ along with GCC; see the file COPYING3.  If not see
 #include <isl/schedule.h>
 #include <isl/ast_build.h>
 #include <isl/schedule_node.h>
+#include <isl/id.h>
+#include <isl/space.h>
 
 typedef struct poly_dr *poly_dr_p;
 
